Question

Noise barriers and it's mechanical properties

Answer 1

 variety of materials may be used for noise wall panels and posts. This section provides details of some of the more common materials: including a description of the material, its features, examples of typical use, special considerations, typical quality verification, and regional considerations, where applicable. n addition, because the selection of a particular surface treatment texture can depend on a number of factors including aesthetic requirements of both sides of the barrier, constructability issues, maintenance concerns, and particularly the type of barrier material, this section also discusses barrier surface treatments. For example, selection of a form liner finish on both sides of a barrier could negate the ability to use horizontally cast precast barrier elements and require the use of either vertically cast precast elements or cast-in-place barriers.

5.1 Concrete

Concrete is one of the world's most common and versatile construction materials (see Figures 70 and 71). It is a mixture produced by combining Portland cement, coarse and fine aggregates, and water, and may also include specific additives to modify curing rate, air entrainment, strength, fluidity, and porosity. For cast-in-place operations, concrete is normally delivered on-site premixed by concrete truck, but for small quantities, it can be mixed on-site. For precast products, the plants usually have their own batch plants capable of providing sufficient quantities to match production.

Answer 2

A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution. Noise barriers are the most effective method of mitigating roadway, railway, and industrial noise sources – other than cessation of the source activity or use of source controls.

In the case of surface transportation noise, other methods of reducing the source noise intensity include encouraging the use of hybrid and electric vehicles, improving automobile aerodynamics and tire design, and choosing low-noise paving material. Extensive use of noise barriers began in the United States after noise regulations were introduced in the early 1970s.